WO1997010746A1 - Anorectal angle measurement - Google Patents
Anorectal angle measurement Download PDFInfo
- Publication number
- WO1997010746A1 WO1997010746A1 PCT/GB1996/002296 GB9602296W WO9710746A1 WO 1997010746 A1 WO1997010746 A1 WO 1997010746A1 GB 9602296 W GB9602296 W GB 9602296W WO 9710746 A1 WO9710746 A1 WO 9710746A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- angular deflection
- rectum
- elongate flexible
- flexible element
- pressure
- Prior art date
Links
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/48—Other medical applications
- A61B5/486—Bio-feedback
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
- A61B1/31—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor for the rectum, e.g. proctoscopes, sigmoidoscopes, colonoscopes
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/03—Detecting, measuring or recording fluid pressure within the body other than blood pressure, e.g. cerebral pressure; Measuring pressure in body tissues or organs
- A61B5/036—Detecting, measuring or recording fluid pressure within the body other than blood pressure, e.g. cerebral pressure; Measuring pressure in body tissues or organs by means introduced into body tracts
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/103—Detecting, measuring or recording devices for testing the shape, pattern, colour, size or movement of the body or parts thereof, for diagnostic purposes
- A61B5/107—Measuring physical dimensions, e.g. size of the entire body or parts thereof
- A61B5/1071—Measuring physical dimensions, e.g. size of the entire body or parts thereof measuring angles, e.g. using goniometers
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
- A61B5/6846—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be brought in contact with an internal body part, i.e. invasive
- A61B5/6847—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be brought in contact with an internal body part, i.e. invasive mounted on an invasive device
- A61B5/686—Permanently implanted devices, e.g. pacemakers, other stimulators, biochips
Definitions
- This invention relates to apparatus and methods for measuring the anorectal angle and more generally to apparatus and methods for measuring, monitoring or observing the local anatomy or selected parameters in the anal canal and/or rectum.
- Measurement of the anorectal angle is part of the investigations undertaken to determine the functionality of the anal canal and rectum in patients suffering defecatory disorders.
- the passage of stools is controlled by a muscular sling which controls the anorectal angle, between an acute angle (closed) and an obtuse angle (open) . Lack of proper control can lead to constipation or faecal incontinence.
- the manometric pressure at various points in the rectum and anal canal may be detected, and electro- yological readings may be taken to determine muscle activity.
- the measurement of the anorectal angle has been performed by inserting into the rectum of the patient a radiological contrast medium which has the consistency of a soft stool, to simulate a soft faecal motion. The patient then sits on a radiolucent toilet and is screened radiologically whilst defecating.
- the difference between the angle of the rectum before and during defecation provides some indication as to whether there may be a functional disorder of the anorectum in patients who have problems in defecating. This procedure is referred to as a defecating proctogra and is unpleasant for the patient, invasive (requiring exposure to radiation) and many Radiological Units will not or cannot perform the procedure.
- this invention provides a method for use in monitoring the anal canal and/or rectum of a patient, which comprises inserting through the anus into the rectum an elongate flexible element and measuring or observing the angular deflection of said flexible element, and/or the contour adopted thereby.
- said angular deflection is measured in a single plane, for example the horizontal plane if the patient is lying on his or her side.
- the change of said angular deflection is measured during a simulated defecatory process.
- said angular deflection is measured using a sensor associated with said elongate flexible element.
- the anorectal angle may be measured without requiring exposure to radiation and without requiring the patient to defecate.
- this invention provides apparatus for use in monitoring the anal canal and/or rectum of a patient, which apparatus comprises an elongate flexible element designed to be introduced via the anus into the rectum and having associated therewith angular deflection detecting means for detecting the angular deflection thereof and/or the contour adopted by said flexible element.
- said angular deflection detecting means comprises an elongate flexible core element and sensor means responsive to longitudinal strain disposed along opposed sides of the core element to determine angular deflection between spaced regions thereof.
- the sensor means comprise respective elongate strain gauges extending along substantially the whole length of the elongate flexible core element at circumferentially spaced locations.
- said elongate flexible element comprises a rubber or rubber-like outer sheath within which is disposed said angular deflection detecting means.
- said outer sheath includes an inflatable region in the distal position thereof, and whereby said region may be inflated in use to stimulate the rectum.
- said apparatus includes pressure detecting means for determining in use the pressure acting in the rectum or adjacent the anus.
- the pressure detecting means may comprise one or more pressure sensors located in the outer sheath or pressure ports disposed in the outer sheath leading to one or more associated sensors.
- a single instrument may be provided which provides a reading of anorectal angle and manometric pressure, and so a 3-D pressure map of pressures within the anorectal region may be constructed.
- this invention provides use of the apparatus as defined as a bio-feedback sensor for training patients with defecatory disorders.
- Figure 3 is a schematic view showing the apparatus in use.
- the apparatus 10 for measuring anorectal angle comprises an outer rubber-like sheath 12, which may be a suitably modified catheter, within which is disposed an elongate angular deflection detector 14 which provides on display 16 a read-out of the angular deflection of the apparatus.
- the angular deflection detector 14 comprises an anchorage or "fixed" end 17 from which extends a core element 18 of flexible wire or cable and four strain gauge wires 20 extending along the length of the core and equispaced at 90° around the core, the whole being covered in thin plastics cover 21 (see Figure 2) .
- Such a detector is obtainable from Penny and Giles Limited, Blackwood, Gwent, U.K.
- the strains experienced by the strain gauge wires 20 are calculated to determine the total strain acting along the whole core on all four sides, thereby to determine the angular deflection between the tip 22 and the anchorage 17. In this particular example, only deflections in the plane of the section shown in Figure 3 are monitored.
- the apparatus includes a mark 24 on the outer sheath to ensure that the instrument is used in the correct orientation. Also, as the accuracy of this particular sensor will be degraded if the angular deflection detector 14 is twisted, the apparatus includes thin flexible strips 26 to either side of the detector to ensure that flexing of the apparatus is confined to the single plane only. From the anchorage 17 the signals are fed by a cable 28 to a processor 30 which drives the display 16.
- the output is also available to interface with a suitable PC/software package (not shown) to allow the output from the instrument to sampled, correlated and/or combined with data from the other sensors for further processing as required.
- the outer sheath 12 has a central bore in which the deflection detector 14 and strips 26 are snugly located, and the sheath 12 is bonded to the detector anchorage 17.
- the sheath induces an inflatable balloon chamber 31 at its distal end, fed by a line 32 which runs back to the proximal end of the device.
- eight pressure sample points 34 are located along the extension of the sheath and respective passages run back to the distal end.
- the apparatus In use, the apparatus is inserted into the anus of a patient with the mark 24 aligned with the anterior plane of the patient and pushed in until the distal end is well into the patient's rectum, as seen in Figure 3. Measurements of angle and pressure may been be taken.
- the balloon 31 may be inflated to stimulate defecation or the patient may be asked to push, and the corresponding change in angle measured.
- the apparatus gives a quick read out which does not require interpretation to determine the actual angle, and so a numerical score can be given easily. There is minimal invasion of patient privacy compared to the defecating proctogram.
- the apparatus is especially suited to bio-feedback, as a patient may be given the apparatus and instructed to practice regularly to obtain a particular angle on the display. In this way, the patient may relearn the appropriate response which may have been lost previously.
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU69934/96A AU6993496A (en) | 1995-09-20 | 1996-09-20 | Anorectal angle measurement |
US09/043,466 US6117091A (en) | 1995-09-20 | 1996-09-20 | Anorectal angle measurement |
DE69618479T DE69618479T2 (en) | 1995-09-20 | 1996-09-20 | ANO-RECTAL ANGLE MEASUREMENT |
AT96931136T ATE211632T1 (en) | 1995-09-20 | 1996-09-20 | ANO-RECTAL ANGLE MEASUREMENT |
EP96931136A EP0862380B1 (en) | 1995-09-20 | 1996-09-20 | Anorectal angle measurement |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9519194.6 | 1995-09-20 | ||
GBGB9519194.6A GB9519194D0 (en) | 1995-09-20 | 1995-09-20 | Anorectal angle measurement |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1997010746A1 true WO1997010746A1 (en) | 1997-03-27 |
Family
ID=10780987
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB1996/002296 WO1997010746A1 (en) | 1995-09-20 | 1996-09-20 | Anorectal angle measurement |
Country Status (7)
Country | Link |
---|---|
US (1) | US6117091A (en) |
EP (1) | EP0862380B1 (en) |
AT (1) | ATE211632T1 (en) |
AU (1) | AU6993496A (en) |
DE (1) | DE69618479T2 (en) |
GB (1) | GB9519194D0 (en) |
WO (1) | WO1997010746A1 (en) |
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- 1995-09-20 GB GBGB9519194.6A patent/GB9519194D0/en active Pending
-
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- 1996-09-20 AT AT96931136T patent/ATE211632T1/en not_active IP Right Cessation
- 1996-09-20 WO PCT/GB1996/002296 patent/WO1997010746A1/en active IP Right Grant
- 1996-09-20 AU AU69934/96A patent/AU6993496A/en not_active Abandoned
- 1996-09-20 US US09/043,466 patent/US6117091A/en not_active Expired - Fee Related
- 1996-09-20 EP EP96931136A patent/EP0862380B1/en not_active Expired - Lifetime
- 1996-09-20 DE DE69618479T patent/DE69618479T2/en not_active Expired - Fee Related
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US4366810A (en) * | 1980-08-28 | 1983-01-04 | Slanetz Jr Charles A | Tactile control device for a remote sensing device |
US4687002A (en) * | 1986-03-06 | 1987-08-18 | Lahr Christopher J | Sphincterogram and anal exercising device |
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Cited By (38)
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Also Published As
Publication number | Publication date |
---|---|
AU6993496A (en) | 1997-04-09 |
GB9519194D0 (en) | 1995-11-22 |
DE69618479T2 (en) | 2002-09-26 |
EP0862380A1 (en) | 1998-09-09 |
US6117091A (en) | 2000-09-12 |
ATE211632T1 (en) | 2002-01-15 |
DE69618479D1 (en) | 2002-02-14 |
EP0862380B1 (en) | 2002-01-09 |
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